<template>
  <div class="shop-cart-content-text">
    <fade-blur-animation>
      <div class="list-mask" @click="hideList" v-show="listShow" transition="fade"></div>
    </fade-blur-animation>
    <div class="shop-cart">
      <div class="content" @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight':totalCount>0}">
              <span class="iconfont" :class="{'highlight':totalCount>0}">&#xe613;</span>
            </div>
            <div class="num" v-show="totalCount>0">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop.prevent="pay">
          <div class="pay" :class="payClass">
            {{payDesc}}
          </div>
        </div>
      </div>
      <div class="ball-container">
        <div v-for="(ball,index) in balls" :key="index">
          <transition
            @before-enter="beforeDrop"
            @enter="dropping"
            @after-enter="afterDrop">
            <div class="ball" v-show="ball.show">
              <div class="inner inner-hook"></div>
            </div>
          </transition>
        </div>
      </div>
      <slide-animation>
        <div class="shop-cart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="food in selectFoods">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cart-control :food="food"></cart-control>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </slide-animation>
    </div>
  </div>
</template>

<script>
  import BScroll from 'better-scroll'
  import DropAnimation from "../fade/DropAnimation"
  import CartControl from "../cartcontrol/CartControl"
  import SlideAnimation from "../fade/SlideAnimation"
  import FadeBlurAnimation from "../fade/FadeBlurAnimation"
  const BALL_LEN = 10
  const innerClsHook = 'inner-hook'
    export default {
        name: "ShopCart",
        components: {
          CartControl,
          DropAnimation,
          SlideAnimation,
          FadeBlurAnimation
        },
        props: {
          selectFoods: {
            type: Array,
            default() {
              return []
            }
          },
          deliveryPrice: {
            type: Number,
            default: 0
          },
          minPrice: {
            type: Number,
            default: 0
          }
        },
        data () {
          return {
            ele: {},
            balls: [{
              show: false
            }, {
              show: false
            }, {
              show: false
            }, {
              show: false
            }, {
              show: false
            }],
            dropBalls: [],
            fold: true
          }
        },
        computed: {
          totalPrice () {
            let total = 0
            this.selectFoods.forEach((food) => {
              total += food.price * food.count
            })
            return total
          },
          totalCount () {
            let count = 0
            this.selectFoods.forEach((food) => {
              count += food.count
            })
            return count
          },
          payDesc() {
            if (this.totalPrice === 0) {
              return `￥${this.minPrice}元起送`
            } else if (this.totalPrice < this.minPrice) {
              let diff = this.minPrice - this.totalPrice;
              return `还差￥${diff}元起送`;
            } else {
              return `去结算`
            }
          },
          payClass() {
            if (this.totalPrice < this.minPrice) {
              return 'not-enough'
            } else {
              return 'enough'
            }
          },
          listShow() {
            if (!this.totalCount) {
              this.fold = true
              return false
            }
            let show = !this.fold
            if (show) {
              this.$nextTick(() => {
                if (!this.scroll) {
                  this.scroll = new BScroll(this.$refs.listContent, {
                    click: true
                  })
                } else {
                  this.scroll.refresh()
                }
              })
            }
            return show
          }
        },
        methods: {
          drop (el) {
            for (let i = 0; i < this.balls.length; i++) {
              let ball = this.balls[i]
              if (!ball.show) {
                ball.show = true
                ball.el = el
                this.dropBalls.push(ball)
                return
              }
            }
          },
          beforeDrop(el) {
            const ball = this.dropBalls[this.dropBalls.length - 1]
            const rect = ball.el.getBoundingClientRect()
            const x = rect.left - 32
            const y = -(window.innerHeight - rect.top - 22)
            el.style.display = ''
            el.style.transform = el.style.webkitTransform = `translate3d(0,${y}px,0)`
            const inner = el.getElementsByClassName(innerClsHook)[0]
            inner.style.transform = inner.style.webkitTransform = `translate3d(${x}px,0,0)`
          },
          dropping(el, done) {
            this._reflow = document.body.offsetHeight
            el.style.transform = el.style.webkitTransform = `translate3d(0,0,0)`
            const inner = el.getElementsByClassName(innerClsHook)[0]
            inner.style.transform = inner.style.webkitTransform = `translate3d(0,0,0)`
            el.addEventListener('transitionend', done)
          },
          afterDrop(el) {
            const ball = this.dropBalls.shift()
            if (ball) {
              ball.show = false
              el.style.display = 'none'
            }
          },
          toggleList() {
            if (!this.totalCount) {
              return
            }
            this.fold = !this.fold
          },
          empty () {
            this.selectFoods.forEach((food) => {
              food.count = 0
            })
          },
          hideList () {
            this.fold = true
          },
          pay () {
            if (this.totalPrice < this.minPrice) {
              return
            }
            window.alert(`支付${this.totalPrice}元`)
          }
        }
    }
</script>

<style lang="stylus" scoped>
  @import "~@/common/stylus/mixin.styl"
    .list-mask
      position: fixed
      top: 0
      left: 0
      width: 100%
      height: 100%
      z-index: 2
      background: rgba(7, 17, 27, 0.6)
    .shop-cart
      position: fixed
      left: 0
      bottom: 0
      z-index: 50
      width: 100%
      height: 48px
      .content
        display: flex
        background: #141d27
        font-size: 0
        color: rgba(255, 255, 255, 0.4)
        .content-left
          flex: 1
          .logo-wrapper
            display: inline-block
            position: relative
            top: -10px
            margin: 0 12px
            padding: 6px
            width: 56px
            height: 56px
            box-sizing: border-box
            vertical-align: top
            border-radius: 50%
            background: #141d27
            .logo
              width: 100%
              height: 100%
              border-radius: 50%
              text-align: center
              background: #2b343c
              &.highlight
                background: rgb(0, 160, 220)
              .iconfont
                line-height: 44px
                font-size: 24px
                color: #80858a
                &.highlight
                  color: #fff
            .num
              position: absolute
              top: 0
              right: 0
              width: 24px
              height: 16px
              line-height: 16px
              text-align: center
              border-radius: 16px
              font-size: 9px
              font-weight: 700
              color: #fff
              background: rgb(240, 20, 20)
              box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4)
          .price
            display: inline-block
            vertical-align: top
            margin-top: 12px
            line-height: 24px
            padding-right: 12px
            box-sizing: border-box
            border-right: 1px solid rgba(255, 255, 255, 0.1)
            font-size: 16px
            font-weight: 700
            &.highlight
              color: #fff
          .desc
            display: inline-block
            vertical-align: top
            margin: 12px 0 0 12px
            line-height: 24px
            font-size: 14px
        .content-right
          flex: 0 0 105px
          width: 105px
          .pay
            height: 48px
            line-height: 48px
            text-align: center
            font-size: 12px
            font-weight: 700
            &.not-enough
              background: #2b333b
            &.enough
              background: #00b43c
              color: #fff
      .ball-container
        .ball
          position: fixed
          left: 32px
          bottom: 22px
          z-index: 200
          transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
          .inner
            width: 16px
            height: 16px
            border-radius: 50%
            background: rgb(0, 160, 220)
            transition: all 0.4s linear
      .shop-cart-list
        position: absolute
        left: 0
        bottom: 48px
        z-index: -1
        width: 100%
        .list-header
          height: 40px
          line-height: 40px
          padding: 0 18px
          background: #f3f5f7
          border-bottom: 1px solid rgba(7, 17, 27, 0.1)
          .title
            float: left
            font-size: 14px
            color: rgb(7, 17, 27)
          .empty
            float: right
            font-size: 12px
            color: rgb(0, 160, 220)
        .list-content
          padding: 0 18px
          max-height: 240px
          overflow: hidden
          background: #fff
          .food
            position: relative
            padding: 12px 0
            box-sizing: border-box
            border-1px(rgba(7, 17, 27, 0.1))
            .name
              line-height: 24px
              font-size: 14px
              color: rgb(7, 17, 27)
            .price
              position: absolute
              right: 90px
              bottom: 12px
              line-height: 24px
              font-size: 14px
              font-weight: 700
              color: rgb(240, 20, 20)
            .cartcontrol-wrapper
              position: absolute
              right: 0
              bottom: 6px
</style>
